Wiha 71904 4 Point Screwdriver Insert Bit 10 Pack

Product Description

The WIHA 71904 is a No. 4 Phillips-point screwdriver insert bit designed for use with 6.3 mm (1/4 inch) hex drive power tools and bit holders. At 25 mm (approximately 1 inch) overall length, this is a standard-length insert bit suited for repetitive fastening tasks in production, maintenance, and service work. The hex shank interfaces directly with quick-change chucks, magnetic bit holders, and impact-rated bit extensions. Sold in a pack of 10, the 71904 is a practical stock item for tool kits and service vans where bit turnover is routine.

This insert bit is appropriate for residential and commercial applications where No. 4 Phillips fasteners appear, including electrical panel work, HVAC equipment assembly, and general mechanical service. The 25 mm length fits standard bit holders and many inline and pistol-grip power screwdrivers. It is commonly used by HVAC technicians, electricians, and plumbers who encounter sheet metal screws and equipment cover fasteners during installation and service calls.

Key Features

• No. 4 Phillips point for larger-diameter fastener heads common in trade equipment
• 6.3 mm hex drive mates with standard 1/4 inch quick-change bit holders and chucks
• 25 mm overall length fits inline bit holders without adapter
• 10-piece pack quantity supports restocking without frequent reorder
• Compact insert format reduces weight in bit rolls and tool pouches

Compatibility

Designed as a standard replacement insert bit for any 6.3 mm (1/4 inch) hex drive bit holder, quick-change chuck, or power screwdriver accepting 25 mm insert-style bits.

Installation Notes

Insert bits should be seated fully into the bit holder or chuck before applying torque to avoid cam-out or bit ejection. Verify the drive tool is set to an appropriate clutch setting for the fastener size before use. Replace worn or deformed bits promptly, as a damaged tip will damage fastener heads and reduce driving control.